CROCHET WITH EMMA • crochetwithemma.com
Crochet Hook Sizes Chart (Metric mm, US Letters & UK Conversion)
By Emma Collins • Original URL: https://crochetwithemma.com/crochet-hook-sizes-conversion-chart/
Quick printable conversion chart matching Metric millimeter (mm) crochet hook sizes to US letters (B-1 to Q) and UK/Canadian numbers.
Skill Level: All Levels Reference
Hook Size: 2.25 mm (B-1) to 10.0 mm (N/P-15)
Total Time: 7 mins
Yield: Printable Hook Conversion Reference
Yarn Weight: All Weights
Gauge: Adjust hook mm to match pattern swatch gauge
Materials & Tools
- 2.25 mm = US B-1 (UK 13) — Sock & Fingering Yarn
- 3.25 mm = US D-3 (UK 10) — Sport Weight & Fine Amigurumi
- 3.50 mm = US E-4 (UK 9) — DK Weight & Worsted Amigurumi
- 3.75 mm = US F-5 — Light DK & Dense Motifs
- 4.00 mm = US G-6 (UK 8) — DK Blankets & Cotton Coasters
- 4.50 mm = US 7 (UK 7) — Light Worsted & Granny Throws
- 5.00 mm = US H-8 (UK 6) — Most Popular Worsted Weight Hook!
- 5.50 mm = US I-9 (UK 5) — Aran & Relaxed Drape Blankets
- 6.00 mm = US J-10 (UK 4) — Light Bulky Yarn
- 6.50 mm = US K-10.5 (UK 3) — Bulky Scarves & Plush Yarn
- 8.00 mm = US L-11 (UK 0) — Super Bulky Throws
- 10.0 mm = US N/P-15 — Chunky Blankets
- Plastic crochet hook & needle gauge sizer card
Abbreviations (US Terms)
mm – millimeter | US – United States letter/number | UK – British/Canadian vintage gauge
Pattern Instructions
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Match Yarn Label Starting Point: Check the crochet hook icon on your yarn ball band for the mill's recommended mm hook size.
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Test Drape vs Structure: Go down 1.0 mm for structured baskets/amigurumi; go up 0.5–1.0 mm for airy shawls and scarves.
Pattern Notes
- Bookmark this page on your phone so you never buy duplicate hook sizes at the craft store!
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